 You must be your fairy godmother. Yes. It doesn't take a fairy godmother to tell you that the right fit means everything. Good heavens, child. You can't go in that. Children under 4'9 need to be in a booster seat because they aren't ready for adult safety belts alone. Remember that 4'9 is the magic number. And get your little pumpkin there safely in a booster seat. Oh, thank you. For more information, visit boosterseat.gov. This has been a message from the U.S. Department of Transportation and the Ad Council.